The search for white dwarfs in Praesepe has been extended by a UBV photographic photometry survey in an additional field of the cluster. When combined with the results of Anthony-Twarog (1982), the Praesepe survey indicates six probable member white dwarfs in the central area of the cluster. Extrapolation of the present main-sequence luminosity function to masses above the turnoff indicates that Mwd, the upper mass limit for white dwarf precursors, is at least 2.5 M_sun;.
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Barbara J. Anthony-Twarog (1984) studied this question.